package com.hardy.job;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author fuxiaohui3@nuoyuan.com.cn
 * @date 2018/11/20 10:14
 */
public class Test3 {
    public static void main(String[] args) {
        HashMap<String,Integer> hashMap = new HashMap<>();
        ConcurrentHashMap<String,Integer> concurrentHashMap = new ConcurrentHashMap<>(hashMap);
    }
}
